53 lines
831 B
Go
53 lines
831 B
Go
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package dh
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func bitShiftWord(a []uint32, n uint32) (i uint32) {
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i = a[n>>ShiftWord]
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return
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}
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// Bit* functions operate on 32-bit words
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func BitClear(a []uint32, n uint32) (i uint32) {
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/*
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#define BIT_CLEAR(a,n) ((a)[(n)>>SHIFT_WORD] &= ~(1L << ((n) & 31)))
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*/
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var x uint32 = bitShiftWord(a, n)
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var y uint32 = uint32(1) << (n & 31)
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var z uint32 = ^y
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i = x & z
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return
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}
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func BitSet(a []uint32, n uint32) (i uint32) {
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/*
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#define BIT_SET(a,n) ((a)[(n)>>SHIFT_WORD] |= (1L << ((n) & 31)))
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*/
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var x uint32 = bitShiftWord(a, n)
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var y uint32 = uint32(1) << (n & 31)
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i = x | y
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return
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}
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func BitTest(a []uint32, n uint32) (i uint32) {
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/*
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#define BIT_TEST(a,n) ((a)[(n)>>SHIFT_WORD] & (1L << ((n) & 31)))
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*/
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var x uint32 = bitShiftWord(a, n)
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var y uint32 = uint32(1) << (n & 31)
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i = x & y
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return
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}
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